I can't remove gxt grid component from ContentPanel

I can't remove gxt grid component from ContentPanel

Hello!

I have a view (in the mvp4g paradigm) which extends com.google.gwt.user.client.ui.Composite. In this view I made initWidget(grid). This view is added to ContentPanel component.
When I change views I do: contentPanel.removeAll() and contentPanel.add(newView).
It result in newView is added to ContentPanel, but grid isn't disappear. Moreother, grid becomes inactive. I can't select a row or resize header.